Turn-around special- Doing a special but facing the opposite way from the direction you started. Press the direction opposite you're facing, let the stick fall to neutral, then press B
Breversal- Doing a special but facing the opposite direction while reversing your momentum. Press B then the direction opposite of the one you're facing (4 frame window).
Wavebounce- Doing a special, and receiving the momentum you'd get with a Breversal but in the same direction you're facing. Press the direction opposite you're facing (as in the turn-around special), press B, then press the direction you were facing (4 frame window).
Breversal- Doing a special but facing the opposite direction while reversing your momentum. Press B then the direction opposite of the one you're facing (4 frame window).
Wavebounce- Doing a special, and receiving the momentum you'd get with a Breversal but in the same direction you're facing. Press the direction opposite you're facing (as in the turn-around special), press B, then press the direction you were facing (4 frame window).